LMP: add -T override and fix version 1 test(s)

The Link Management Protocol version 1 sample capture added to the tests
directory in commit 212eef2 was produced using non-standard UDP port
49998. Later assignment of port 701 reflected in commit 960aee5 made it
impossible to decode the capture.

This change adds a -T override for LMP, uses it to replace the broken
test with two working tests and dismisses the custom test script,
lmp.sh.